Bug report: Change size of hard drive when deploying from a cloned template
There is a bug existed for a long while, from VI 3.5 to vSphere 5.0. Just be attention.
When you create a new vm by deploying it from a template, at the last step, you can change some hardware settings. Make sure do NOT change the size of the hard drivers listed in that window. Or, the new created VM will use the hard drive from the template directly instead of making a copy of it. Yes, by doing that, the original template may be corrupt. And, even the wrose, if you choose to delete the new created vm from disk, this hard drive file will be deleted also.